<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>bufferCount</title>
<script src="https://npmcdn.com/@reactivex/rxjs@5.0.0-beta.3/dist/global/Rx.umd.js"></script>
</head>
<body>
</body>
</html>
//emit every 5s
const source = Rx.Observable.interval(5000);
//emit every 1s
const secondSource = Rx.Observable.interval(1000);
const example = source
.withLatestFrom(secondSource)
.map(([first, second]) => {
return `First Source (5s): ${first} Second Source (1s): ${second}`;
});
/*
"First Source: 0 Second Source: 4"
"First Source: 1 Second Source: 9"
"First Source: 2 Second Source: 14"
...
*/
const subscribe = example.subscribe(val => console.log(val));
//withLatestFrom slower than source
const exampleTwo = secondSource
//both sources must emit at least 1 value (5s) before emitting
.withLatestFrom(source)
.map(([first, second]) => {
return `Source (1s): ${first} Latest From (5s): ${second}`;
});
/*
"Source (1s): 4 Latest From (5s): 0"
"Source (1s): 5 Latest From (5s): 0"
"Source (1s): 6 Latest From (5s): 0"
...
*/
const subscribeTwo = exampleTwo.subscribe(val => console.log(val));
Output
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